work, over 400 people are promoted every day. healthcare starting under $40 a month. i got education benefits. i work at walmart. i'm a pharmacist. sales associate. i manage produce. i work in logistics. there's more to walmart than you think. vo: opportunity. that's the real walmart. >> pelley: at the end of the long thanksgiving weekend, one thought occurs-- "why did i eat so much?" not just thursday's feast, but the sandwiches, the leftovers, and the football snacks that followed. two years ago, morley safer offered the comforting thought that it may not be all your fault. that's when he introduced "the flavorists," experts from givaudan-- the largest flavoring company in the world-- whose job it is to lead us into temptation, and then keep us there. >> you know, a burst in the beginning. and maybe a... a finish that doesn't linger too much so that you want more of it. >> safer: aha. so i see it's got to be a quick fix and then... >> have more. >> safer: but that suggests something else, which is called addiction. >> exactly. >> safer: you're trying to create an addictive taste?